Retrieving "Broad Line Region (blr)" from the archives

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   Broad-Line Regions (BLR)
   The broad emission lines are produced in the Broad-Line Region (BLR)/), a volume of ionized gas orbiting the central SMBH/) at distances typically ranging from $10^{15}$ to $10^{17}$ meters. The width of these lines, often thousands of kilometers per second ($\text{km s}^{-1}$), directly reflects the high orbital velocities within this region, allowing for mass estimation of the central black hole via Keplerian dynamics, provided th…